Question CPU clocks oscillate between few MHz

[Durixx]

Hello!

I've got my i5 8600k clocked @ 4,5GHz, 1.2v; never had any issues.

However, as I've recently noticed, my CPU clocks tends to oscillate between 4.498MHz and 4.502MHz, rather than staying fixed at 4.5GHz. Is that normal, or is it something that I should look into?

EDIT: SpeedStep is disabled for the moment.

https://imgur.com/a/vRgGbvw

View: https://imgur.com/a/vRgGbvw


Specs:

MB: MSI Z370-A PRO
CPU: i5 8600k @ 4.5GHz
Cooler: SilentiumPC Fera 3
GPU: Gigabyte 1070 Ti
RAM: Kingston HyperX Predator DDR4 16GB (2x8GB) 3200MHz CL16
HDD: Seagate Barracuda 1TB
PSU: Corsair RM750x

 

[Lutfij]

When not taxed(idle) does the multiplier go down? Is 1.2v the lowest you can go while on that overclock?

 

[Durixx]

Screenshots were taken while idle. And yes, I believe that's the lowest I can go.

 

[Durixx]

I've decided to change the clocks to stock value, to see if anything changes. Nope, still oscillating ~ 2 MHz. (4098 - 4102 MHz under stress)

 

[BFG-9000]

That's normal, even if all the "spread-spectrum" clocking settings are disabled in the BIOS. With those settings enabled, the spread is even higher at 0.25%, which in your case would be around 10MHz.

Spread-spectrum is often required to pass FCC certification testing, to reduce the measured EMI emissions to within acceptable legal limits

 

[Digicats]

That's normal.

 

[mdd1963]

100% normal with pretty much every motherboard in existence..